Luokka Biologiabulgariaenglantiespanjaesperantohollantiitaliajapanikreikkalatinalatvialiettuanorjaportugalipuolaranskaruotsisaksasuomitanskaturkkitšekkiunkarivenäjäviro

apocrine apocytium apodal apodous apollo apolysis apomeiosis apoplast apoptosis apoptosome aporose aposematism aposymbiosis appendical appendiculate appressed appressed-fibrillose appressed-silky apterous aptotic arachnoid arbuscle archaean archaebacteria archaeostomatous archaeplastid archebacterium archegony archiblastula archosaur arciferal arcopallium arenicolous areolate

arista arthro- arthrophyte arthropodization artificial insemination artificial selection arundinoid ascarid ascococcus asconoid ascospore ascovirus asexual asexual reproduction associate aster asterisk astomatous astral asymbiosis atavistic athermotactic atomate atrium attenuation aulate auriculated autapomorphic autoaggressive autochory autochthonous autocrine autodegradation

autodigestion autoecism autofluorescence autogenesis autohydrogenotrophic autointegration autolyze automimicry automixis autopathy autophagosome autophagy autorecognition autoregulation autotroph autotrophic autotrophy auxesis auxology auxospore auxotrophic auxotrophy avicolous avicularium avidin avihepadnavirus axenic axenically axiogenesis axodine axogenesis axon hillock axoneme